Home
Class 12
PHYSICS
Electric current is sent through a resis...

Electric current is sent through a resistance of `20 Omega` from a battery of emf 2V and of negligible internal resistance .During measurements of current with the help of an ammeter , 20% error is incurred.What is the resistance of the ammeter?

Text Solution

Verified by Experts

The correct Answer is:
`5 Omega`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXERCISE ( PROBLEM SET-II)|25 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXERCISE ( HOT NUMERICAL PROBLEMS)|5 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXERCISE ( SHORT ANSWER TYPE QUESTION-II)|7 Videos

  • COMMUNICATION STSTEM

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|28 Videos

  • DIFFRACTION AND POLARISATION OF LIGHT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|27 Videos

Similar Questions

Explore conceptually related problems

Current is sent through a galvanometer of resistance 50 Omega from a battery of emf 30V and of negligible internal resistance.There is a shunt of resistance 2 Omega connected in parallel with the galvanometer.Find out the resistance that should be connected in series with the battery to get a current of 10mA through the galvanometer.

An electric cell is sending electric currents through a resistance of 10 Omega . IF a shunt of 1 Omega is connected with that resistance then the current through the 10 Omega resistance becomes half of the previous value.What is the resistance of the cell?IF the current through the shunt be 0.9A, then what will be the emf of the cell?

Current is sent from an electric cell of emf 30 V and of negligible internal resistance through a resistance of 200 Omega . When an ammeter is introduced into the circuit is given a reading of 147 mA. Determine the resistance of the ammeter and also the percentage error in the measurements of current.

The internal resistance of a battery of 100 V is 5 Omega . When the emf of the battery is measured by a voltmeter 20% error is found. What is the resistance of the voltmeter?

A resistance of 12 Omega is connected with a battery of emf 1.5volt to have 0.1A current. What is the intemal resistahce of the battery?

If a current of strength 3 A flows through a resistance of 20 Omega for 10 minutes, then calculate the amount of heat produced in the resistance.

Two identical cells, each of emf E, having negligible internal resistance, are connected in parallel with each other across an external resistance R. What is the current through this resistance?

A potentiometer wire of length 100 cm has a resistance of 10Omega . It is connected in series with a resistance and a cell of emf 2V and of negligible internal resistance. A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of external resistance ?

CHHAYA PUBLICATION-CURRENT ELECTRICITY -EXERCISE ( PROBLEM SET-I)
  1. With two resistances 2 Omega and 3 Omega In parallel a third resistanc...

    Text Solution

    |

  2. Equivalent resistances of two resistors in their series and parallel c...

    Text Solution

    |

  3. The equivalent resistances of two resistances in parallel combination ...

    Text Solution

    |

  4. There are 14 resistances each of magnitude 1 Omega. Keeping three of t...

    Text Solution

    |

  5. The resistance of an electrical appliance is 200 Omega and it can with...

    Text Solution

    |

  6. The ratio of three resistances is 1:2:3 if the greatest resistance be ...

    Text Solution

    |

  7. Emf of an electric cell is 2.1 V and its internal resistance is 0.1 Om...

    Text Solution

    |

  8. Emf of an electric cell is 1.5 V and its internal resistance Is 2 Omeg...

    Text Solution

    |

  9. A cell of emf 2.1 V and 0.1 Omega internal resistance sends 100 mA cur...

    Text Solution

    |

  10. Electric current is sent through a resistance of 20 Omega from a batte...

    Text Solution

    |

  11. Internal resistance of an electric cell is 1 Omega. Error is incurred ...

    Text Solution

    |

  12. Current is sent from an electric cell of emf 30 V and of negligible in...

    Text Solution

    |

  13. An electric cell of emf 2V and of negligible internal resistance is co...

    Text Solution

    |

  14. Internal resistance of each of 30 identical cells is 3Omega. To get th...

    Text Solution

    |

  15. Emf of each of 15 cells is 2V and internal resistance of each is 0.1 O...

    Text Solution

    |

  16. 5 electric cells are connected in series .Emf of each cell is 1.5 V an...

    Text Solution

    |

  17. When a resistance of 4.5 Omega is connected with 10 identical cells in...

    Text Solution

    |

  18. Calculate the number of electrons crossing a given cross section in 1 ...

    Text Solution

    |

  19. The number of free electrons per unit volume in a metallic conductor i...

    Text Solution

    |

  20. Estimate the average drift speed of conduction electrons in a copper w...

    Text Solution

    |